USP Type VII gauze, 100% woven-cotton with blue filament that runs through each sponge and has a unique wave pattern to ensure easy x-ray detection. Sterile sponges are packaged in rigid plastic tray with peel back lid. Both sterile and non-sterile sponges are banded in 10's to ensure accurate count.- Gauze Sponge, 8" x 4" X-Ray Detectable Type VII, 24-Ply, Non-Sterile, 50/bg, 20 bg/cs